A radial hole machining clamp device for shaft parts

Abstract

This invention discloses a fixture for machining radial holes in shaft-type parts, comprising a fixture, a positioning shaft that can be inserted into the radial hole of the shaft-type part, and a drill sleeve for replacing the positioning shaft. The fixture has a clamping part and a locking assembly for locking the shaft-type part to the clamping part. At least one side of the clamping part has a guide sleeve and a positioning assembly for fixing the position of the guide sleeve. The positioning shaft is detachably inserted into the guide sleeve. This invention helps to ensure the machining accuracy of radial holes and overcomes the part replacement problem of machining high-precision holes in multi-part, multi-angle stacked components.

Description

Technical Field

[0001] This invention relates to the field of machining fixture technology, and in particular to a fixture device for machining radial holes in shaft-type parts. Background Technology

[0002] A piston rod assembly structure on an aircraft, such as Figure 1 As shown, it includes a piston rod 11, a lower torque arm 12, a hinge shaft 13, a locking pin 14, and nuts matching the hinge shaft 13 and the locking pin 14. The lower torque arm 12 and the piston rod 11 are hinged through the hinge shaft 13. The locking pin 14 passes through the piston rod 11 and the hinge shaft 13, thereby fixing the hinge shaft 13 and the piston rod 11 in a fixed connection.

[0003] Due to the large size, high strength, and high assembly precision requirements of the components, and the existence of processing errors in the parts, it is impossible to meet the precision requirements after assembly. Therefore, after assembling on the assembly frame, the hinge shaft 13 is rotated by a certain angle, and the center line of the drilling is set at a certain angle offset from the axis of the piston rod 11. After stacking the parts (the assembly angle of the piston rod 11, bushing and hinge shaft 13 is adjusted and the position is fixed after assembly), the φ6H7 pin hole is drilled, enlarged and reamed.

[0004] Because the piston rod 11 is large and irregularly shaped, it cannot be machined and must be operated manually. Due to differences in skill levels and the high strength and difficulty in machining the components, there will be an angular error of less than 1° when drilling manually. In addition, when drilling the upper part of the φ6 pre-hole, because the hinge shaft 13 has a φ8 mm center hole, when drilling the lower φ6 pre-hole, the drill bit will cut asymmetrically due to the influence of the arc surface of the φ8 center hole, and the φ6 pre-hole will also have uncontrollable deviation. This makes each hinge shaft 13 non-interchangeable and can only be matched one-to-one.

[0005] The hinge shaft 13 is a critical component, made of ultra-high strength steel with a tensile strength of not less than 1750 MPa. During maintenance, non-destructive testing revealed cracks, necessitating replacement. In the repair process, only the hinge shaft 13 was replaced; the piston rod 11, lower torque arm 12, and bushing were not replaced. Since the φ6H7 hole on the old shaft was drilled together after assembly and reamed in two stages (roughing and finishing), the new hinge shaft 13 needed to be drilled based on this old hole. How to drill and ream the φ6H7 through hole on the new shaft became a technological challenge. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a radial hole machining fixture device for shaft parts that is conducive to improving the machining accuracy of holes and overcoming the part change problem of high-precision hole configuration in multi-part, multi-angle stacked parts machining.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A fixture for machining radial holes in shaft-type parts includes a fixture, a positioning shaft that can be inserted into the radial hole of the shaft-type part, and a drill sleeve for replacing the positioning shaft. The fixture has a clamping part and a locking assembly for locking the shaft-type part to the clamping part. At least one side of the clamping part has a guide sleeve and a positioning assembly for fixing the position of the guide sleeve. The positioning shaft is detachably inserted into the guide sleeve.

[0008] As a further improvement to the above technical solution: the positioning component includes a seal and a heating cover, and there is a gap between the outer periphery of the guide sleeve and the clamp to form a filling cavity for filling temperature phase change material. The seal and the heating cover are arranged opposite to each other on both sides of the filling cavity.

[0009] As a further improvement to the above technical solution: the outer cylindrical surface of the guide sleeve and the side wall of the filling cavity are both provided with spiral grooves.

[0010] As a further improvement to the above technical solution: the temperature phase change material contains triangular pyramids that can be embedded in the spiral groove.

[0011] As a further improvement to the above technical solution: the spiral groove on the outer cylindrical surface of the guide sleeve rotates in the opposite direction to the rotation direction of the cutting tool.

[0012] As a further improvement to the above technical solution: the temperature phase change material is a Sn-Sb-Cu alloy, and the surface of the spiral groove is provided with a silver plating layer.

[0013] As a further improvement to the above technical solution: the temperature phase change material is a spherical particle material.

[0014] As a further improvement to the above technical solution: the positioning shaft includes a first segment that can be inserted into a radial hole of a shaft-like part, a second segment that passes through the guide sleeve, and a first flange located at one end of the second segment away from the first segment. The diameter of the first segment is smaller than the diameter of the second segment to form a stepped portion that abuts against the shaft-like part. One end of the drill sleeve is provided with a second flange. The first flange and the second flange are used to be detachably connected to the guide sleeve.

[0015] As a further improvement to the above technical solution: the drill bushing has a hollow structure; and / or, the inner surface of the drill bushing is provided with a lubricating layer.

[0016] As a further improvement to the above technical solution: the radial hole machining fixture for shaft parts also includes a sleeve, the fixture is inserted in the sleeve, the top surface of the sleeve is provided with a shrinkage slit and the middle part of the bottom surface is an arc structure, the height of the two ends of the bottom surface of the sleeve is greater than that of the middle part and is provided with fasteners.

[0017] Compared with the prior art, the advantages of the present invention are as follows: This invention discloses a radial hole machining fixture for shaft parts. In use, the existing hinged shaft is first installed in the clamping part and fixed thereby using a locking assembly. Then, a positioning shaft is inserted through a guide sleeve into the radial hole of the existing shaft. The positioning shaft defines the position of the guide sleeve, which is then fixed by the positioning assembly. This allows the radial hole on the existing shaft to be brought out onto the guide sleeve, regardless of the direction or angle of the radial hole's offset. Finally, the positioning shaft is removed from the guide sleeve, and a drill bushing is installed in it. The existing shaft is then removed from the clamping part using the locking assembly. A new hinged shaft with the radial hole to be machined is installed in the clamping part and fixed by the locking assembly. The drill bit and boring tool can then machine the radial hole along the drill bushing on the new shaft. This method helps ensure the machining accuracy of the radial hole and overcomes the challenge of changing parts when machining high-precision holes in multi-part, multi-angle stacked components.

[0018] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the piston rod assembly involved in the present invention, wherein (a) is a perspective view, (b) is an exploded view, and (c) is a cross-sectional view of the hinge portion. Figure 2 This is a three-dimensional structural schematic diagram of the fixture device for machining radial holes in shaft-type parts according to the present invention.

[0020] Figure 3 This is a cross-sectional structural schematic diagram of the radial hole machining fixture device for shaft parts according to the present invention.

[0021] Figure 4 This is a three-dimensional structural diagram of the clamp in this invention.

[0022] Figure 5 This is a cross-sectional view of the fixture in this invention.

[0023] Figure 6 This is a cross-sectional view of the guide sleeve in this invention.

[0024] Figure 7 This is a three-dimensional structural diagram of the positioning shaft in this invention.

[0025] Figure 8 This is a three-dimensional structural diagram of the drill sleeve in this invention.

[0026] Figure 9 This is a cross-sectional structural diagram of the sealing element in this invention.

[0027] Figure 10 This is a three-dimensional structural diagram of the triangular pyramid in this invention.

[0028] The labels in the diagram represent: 11. Piston rod; 12. Lower torque arm; 13. Hinge shaft; 14. Locking pin; 2. Fixture; 21. Clamping part; 22. Locking assembly; 3. Positioning shaft; 31. First segment; 32. Second segment; 33. First flange; 4. Drill bushing; 41. Second flange; 5. Guide sleeve; 51. Spiral groove; 6. Positioning assembly; 61. Seal; 62. Heating cover; 7. Triangular pyramid; 8. Jacket; 81. Contraction joint; 82. Fastener. Detailed Implementation

[0029] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] In this invention, unless otherwise explicitly specified and limited, the terms "assembly," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Figures 2 to 10This invention illustrates an embodiment of a fixture for machining radial holes in shaft-type parts. The fixture includes a fixture 2, a positioning shaft 3 insertable into the radial hole of the shaft-type part, and a drill sleeve 4 for replacing the positioning shaft 3. The fixture 2 has a clamping portion 21 and a locking assembly 22 for locking the shaft-type part to the clamping portion 21. At least one side of the clamping portion 21 has a guide sleeve 5 and a positioning assembly 6 for fixing the position of the guide sleeve 5. The positioning shaft 3 is detachably inserted into the guide sleeve 5. See details below. Figures 4 to 5 Preferably, the locking assembly 22 includes a pin at one end of the clamp and a locking nut at the other end of the clamp. The locking nut can be equipped with a washer to increase the friction between it and the clamp 2. After the old part of the hinge shaft 13 is inserted into the clamp 2, the locking nut is tightened until the boss at the left end of the old part is close to the pin. Conversely, after unscrewing the locking nut, the old part can be pulled out of the clamp 2. The structure is simple and effective. The clamping part 21 is provided with guide sleeves 5 and positioning assemblies 6 on both the upper and lower sides, so that holes can be drilled from the upper and lower sides of the new part of the hinge shaft 13. This processing method effectively avoids the problem of displacement caused by the intermittent cutting of the center hole of the hinge shaft 13 by the drill bit. The processing method of boring from the upper and lower sides is conducive to shortening the tool bar length, reducing the hole processing depth, and effectively reducing the processing difficulty of machining ultra-high strength steel holes in the radial direction of the cylinder.

[0034] In this embodiment of the radial hole machining fixture for shaft parts, the old hinged shaft 13 is first installed on the clamping part 21, and then fixed to the clamping part 21 by the locking assembly 22. Then, the positioning shaft 3 is inserted through the guide sleeve 5 into the radial hole of the old part (i.e.,...). Figure 1 In the φ6H7 hole, the position of the guide sleeve 5 is defined by the positioning shaft 3, and the position of the guide sleeve 5 is fixed by the positioning component 6, thereby leading the radial hole on the old part to the guide sleeve 5. No matter which direction the radial hole on the old part is offset by, it can be led out. Finally, the positioning shaft 3 is removed from the guide sleeve 5 (since the positioning shaft 3 and the guide sleeve 5 need to be precisely matched, preferably, an internal thread hole can be set in the second section 32 of the positioning shaft 3, and the positioning shaft 3 can be taken out from the guide sleeve 5 with the help of a sliding hammer), and the drill bushing 4 is installed in the guide sleeve 5. The old part is taken out from the clamping part 21 by the locking component 22, and the new part of the hinge shaft 13 to be processed radial hole is installed in the clamping part 21 and fixed by the locking component 22. The drill bit and boring tool can then process the radial hole on the new part along the drill bushing 4, which helps to ensure the processing accuracy of the radial hole and overcomes the part change problem of processing high-precision holes in multi-part, multi-angle stacked parts.

[0035] See details Figure 3 and Figure 5Furthermore, in this embodiment, the positioning component 6 includes a sealing element 61 and a heating cover 62. A gap exists between the outer periphery of the guide sleeve 5 and the clamp 2 to form a filling cavity for filling with a temperature phase change material. The sealing element 61 and the heating cover 62 are arranged opposite each other on both sides of the filling cavity (specifically, the upper and lower sides). The temperature phase change material is heated by the heating cover 62, causing it to melt from a solid state to a liquid state, filling all the gaps in the filling cavity. Then, heating is stopped, causing it to change from a liquid state to a solid state, thereby firmly bonding the guide sleeve 5 to the clamp 2, fixing the accurate position of the guide sleeve 5, and avoiding the disadvantages of pressure stress deformation caused by pressure plates or other mechanical pressure fixing methods, effectively ensuring accurate positioning and clamping. Since each hinge shaft 13 is not interchangeable and can only be configured one-to-one, after configuring one old shaft, the heating cover 62 is heated again to turn the temperature phase change material into a liquid state. At this time, the liquid material can be sucked out with the help of tools such as a soldering pump, and the guide sleeve 5 returns to a free state from a fixed state, so that it can be put into the configuration of the next set of piston rod assemblies, realizing a flexible self-adjusting function. Preferably, see Figure 9 The sealing element 61 is a fluororubber sealing ring, which can withstand a high temperature of 260°C without deformation, thus preventing leakage of the liquid phase change alloy material; the heating cover 62 is an electric heating cover and is fixed to the clamp 2 by bolts and screws, which is convenient to operate and has high heating efficiency. Of course, other heating methods can also be used in other embodiments.

[0036] Furthermore, in this embodiment, the outer cylindrical surface of the guide sleeve 5 and the sidewall of the filling cavity are both provided with spiral grooves 51. The spiral grooves 51 increase the contact area between the guide sleeve 5, the clamp 2 and the liquid temperature phase change material, thereby increasing the bonding force between the guide sleeve 5 and the clamp 2.

[0037] See details Figure 10 Furthermore, in this embodiment, the temperature phase change material contains triangular pyramids 7 that can be embedded in the spiral groove 51. After the temperature phase change material cools and solidifies, the triangular pyramids 7 are completely embedded in the tooth-angle cavity of the spiral groove 51, thereby firmly bonding the guide sleeve 5 to the clamp 2 and further increasing the bonding strength. The triangular pyramids 7, combined with the "soft matrix + hard points" microstructure formed by the temperature phase change material, have both good anti-galling and excellent thermal conductivity, which can meet the cutting force impact during drilling, quickly conduct away the cutting heat generated during processing, reduce the expansion caused by tool heating, and prevent tool and drill sleeve 4 from galling.

[0038] In a preferred embodiment, the spiral groove 51 on the outer cylindrical surface of the guide sleeve 5 has the opposite spiral direction to that of the cutting tool. The cutting tool generally performs right-hand cutting, and correspondingly, the spiral groove 51 on the outer cylindrical surface of the guide sleeve 5 is a left-hand thread groove. During cutting, the cutting force makes the guide sleeve 5 increasingly tight, which can prevent the guide sleeve 5 from loosening during drilling, boring, and reaming. The structure is reasonable and effective.

[0039] Furthermore, in this embodiment, the temperature phase change material is a Sn-Sb-Cu alloy, with a phase change temperature of 198±5℃ from solid to liquid. This allows the guide sleeve 5 to be firmly bonded to the clamp 2, and it also has good thermal conductivity. The surface of the spiral groove 51 is provided with a silver plating layer (not shown in the figure). Through the silver plating treatment, the bonding force between the surface of the spiral groove 51 and the liquid Sn-Sb-Cu alloy is increased. Preferably, the triangular pyramid 7 is made of high-strength alloy steel.

[0040] As a preferred embodiment, the temperature phase change material is a spherical particulate material with good fluidity, which is beneficial for uniform mixing with the triangular pyramid 7.

[0041] See details Figure 5 and Figure 7 In this embodiment, the positioning shaft 3 includes a first segment 31 that can be inserted into a radial hole of a shaft-like part, a second segment 32 that passes through a guide sleeve 5, and a first flange 33 located at the end of the second segment 32 away from the first segment 31. The diameter of the first segment 31 is smaller than the diameter of the second segment 32 to form a stepped portion that abuts against the shaft-like part. One end of the drill sleeve 4 is provided with a second flange 41. The first flange 33 and the second flange 41 are used to detachably connect with the guide sleeve 5. First, the guide sleeve 5 is placed in the fixture 2, and then the positioning shaft 3 is inserted into the guide sleeve 5. The first segment 31 is gradually inserted into the radial hole of the old part until the stepped portion abuts against the old part. The guide sleeve 5 is then positioned by the positioning shaft 3. At this time, the first flange 33 abuts against the upper surface of the guide sleeve 5, indicating that the positioning shaft 3 is inserted in place. Preferably, there is a gap between the lower end face of the guide sleeve 5 and the old part, which facilitates the removal of the old part; the first flange 33 and the second flange 41 are connected to the guide sleeve 5 by bolts and screws, which has good reliability and is easy to disassemble and assemble.

[0042] See details Figure 8 Furthermore, in this embodiment, the drill sleeve 4 has a hollow structure, and a lubricating layer (not shown in the figure, but could be a graphene lubricating layer) is provided on the inner surface of the drill sleeve 4. Providing a lubricating layer reduces the friction between the drill sleeve 4 and the drill bit, boring tool, and reamer, thereby reducing frictional heat generation and enabling stable operation over a long period.

[0043] See details Figure 2 and Figure 3In this embodiment, the radial hole machining fixture for shaft parts further includes a sleeve 8, with a clamp 2 passing through the sleeve 8. The top surface of the sleeve 8 has a contraction joint 81, and the middle part of the bottom surface has an arc structure. The height of the two ends of the bottom surface of the sleeve 8 is greater than that of the middle part, and fasteners 82 (such as bolts, screws, etc.) are provided. When the contraction joint 81 on the sleeve 8 is loosened or contracted, it can tighten or loosen the cylindrical clamp 2, making it convenient for the clamp 2 to rotate and adjust its angle within the sleeve 8. The arc structure of the bottom surface can serve as a fulcrum. By adjusting the tightness of the fasteners 82, the tilt angle of the sleeve 8 and the clamp 2 can be steplessly adjusted, thus enabling adjustable clamping of holes with multiple oblique angles.

[0044] The specific method of using the radial hole machining fixture for shaft parts of the present invention is as follows: Insert the old hinge shaft 13 with micro-cracks into the clamping part 21 of the fixture 2. The left end boss of the shaft is pressed against the outer cylindrical surface of the pin. Insert the washer and tighten the hex nut (i.e., the locking nut). Tighten the hex nut clockwise with an open wrench so that the left end boss of the old hinge shaft 13 is pressed against the pin, thereby achieving anti-rotation and positioning of the old part.

[0045] Place the guide sleeve 5 into the fixture 2, then insert the positioning shaft 3 into the guide sleeve 5. The first segment 31 is gradually inserted into the radial hole of the old part until the stepped part abuts against the old part. The guide sleeve 5 is then positioned by the positioning shaft 3. At this time, the first flange 33 abuts against the upper end face of the guide sleeve 5, indicating that the positioning shaft 3 is inserted in place. Then, the first flange 33 and the guide sleeve 5 are fixedly connected by screws or the like.

[0046] A sealing element 61 is installed on the lower end face of the internal thread of fixture 2 and the lower end face of guide sleeve 5 to prevent the triangular pyramid 7 and Sn-Sb-Cu alloy liquid from flowing downwards. A layer of triangular pyramid 7 is alternately placed in the filling cavity, followed by Sn-Sb-Cu alloy spheres, until the entire filling cavity is filled. Fixture 2 is shaken to fill the entire filling cavity with Sn-Sb-Cu alloy spheres. The heating cover 62 is then placed on top, and the screws are tightened to lock the heating cover 62 onto fixture 2. Fixture 2 is rotated 180° along the axis of the original part, and this process is repeated to obtain the desired result. Figure 5 The structure shown.

[0047] The heating cover 62 is connected to the power supply and begins to heat up. When the temperature reaches 198℃±5°, the inner spherical Sn-Sb-Cu alloy in the filling cavity melts from a solid to a liquid state, filling all the gaps in the filling cavity. The threaded cavity is also filled with a mixture of Sn-Sb-Cu alloy liquid and triangular pyramid 7. The power supply is then cut off, and the heating cover 62 stops heating. After cooling at room temperature for a period of time, the Sn-Sb-Cu alloy changes from a liquid state to a solid state, firmly locking the guide sleeve 5 in the fixture 2. The positioning shaft 3 is responsible for leading the radial φ6H7 hole on the old part to the guide sleeve 5. No matter which direction or angle the radial φ6H7 hole on the old part is offset, it can be accurately led out. The solidified triangular pyramid 7 and Sn-Sb-Cu alloy firmly bond the guide sleeve 5 to the fixture 2, fixing the guide sleeve 5 in an accurate position. This method avoids the stress deformation defects of mechanical clamping methods such as pressure plates, effectively ensuring accurate positioning and clamping. Furthermore, its "soft matrix + hard points" microstructure combines good anti-galling and excellent thermal conductivity, which can withstand the cutting force impact during drilling, while quickly dissipating the cutting heat generated during processing, reducing the expansion caused by tool heating, and eliminating the possibility of tool seizing with drill sleeve 4. Rotate fixture 2 along the axis of the old part by 180°, and repeat this process to also bond the lower guide sleeve 5 into fixture 2.

[0048] Start processing: Loosen the screws used to fix the positioning shaft 3 on the cured fixture 2 by rotating a flathead screwdriver. Screw a sliding hammer into the internal threaded hole in the center of the positioning shaft 3. Use the hammering force of the sliding hammer to pull out the positioning shaft 3 from the guide sleeve 5. Insert the drill sleeve 4 into the hole of the guide sleeve 5. Screw the screws in again to fix the drill sleeve 4 on the fixture 2.

[0049] Insert the clamp 2 with the drill sleeve 4 installed into the clamp 8 and place it in the jaws of the vise. Then remove the old part from the clamp 2 and insert the new hinge shaft 13 into the clamp 2 and lock it in place by the locking assembly 22.

[0050] Insert the locating pin into the machine tool spindle chuck, lower the spindle, and use the locating pin to align the drill sleeve 4. If it is not in the correct position, rotate the chuck 2, adjust the adjusting screws at both ends of the collet 8 (forward and reverse rotation), and move the worktable to allow the locating pin to insert into the drill sleeve 4 and lock it in place. Replace the chuck with a φ5.7 drill bit, start the spindle and rotate it clockwise to drive the drill bit to begin drilling a pre-hole in the new workpiece. Drill to the center of the new workpiece, then retract the drill bit and replace it with a φ5.9 boring tool. The excellent thermal conductivity of the Sn-Sb-Cu alloy can quickly conduct away the cutting heat generated during machining, reducing thermal expansion caused by tool heating and preventing tool seizing with the drill sleeve 4. Adjust the speed, start the spindle and rotate it clockwise, and the boring tool will begin boring the hole in the new workpiece. Boring to the center of the new workpiece is sufficient, then retract the boring tool. The boring tool can correct the offset error generated during the drilling process, improving the position and hole diameter accuracy. After replacing the boring bar with a φ6.0, the precision boring achieved the technical requirements of the drawing.

[0051] After machining the upper half of the φ6.0H7 through hole, remove the drill bushing 4, install the positioning shaft 3, and lock the positioning shaft 3 onto the fixture 2. Rotate the fixture 2 180° and repeat the above machining process to machine the lower half of the φ6.0H7 through hole.

[0052] Remove the drill bushing 4 and take out the positioning shaft 3. Then, pull out the machined new part and chamfer the hole opening by hand with a chamfering tool. Clean off any excess material, and then assemble it into the mounting hole of the piston rod 11. Insert the locking pin 14 and tighten the locking nut. This process eliminates the need for further repair and machining after assembly, avoiding damage to the precision of the holes in important components such as the piston rod 11 during repair and machining.

[0053] The machining method of drilling holes from both ends of the new part effectively avoids the displacement caused by the intermittent cutting of the drill bit by the shaft center hole; the boring of the new part from both ends shortens the tool holder and reduces the hole machining length, effectively solving the machining difficulty of ultra-high strength steel holes in cylindrical radial drilling; the boring tool roughing and finishing along the drill bushing with precision boring at both ends ensures the position and diameter accuracy of the holes, effectively solving the part change problem of high-precision hole configuration for multi-part, multi-angle stacked parts.

[0054] Since each old shaft is not interchangeable, it can only be matched one-to-one. After the matching of an old shaft is completed, the heating cover 62 is connected to the power supply and starts to heat up. When the temperature is heated to 198℃±5°, the Sn-Sb-Cu alloy embedded in the filling cavity melts from solid to liquid. At this time, the liquid Sn-Sb-Cu alloy can be removed with a solder suction device, and the guide sleeve 5 returns from the locked state to the free state. It can be put into the matching of the next set of piston rod assembly, realizing the flexible self-adjustment function of Sn-Sb-Cu alloy connection.

[0055] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A fixture for machining radial holes in shaft-type parts, characterized in that: The device includes a clamp (2), a positioning shaft (3) that can be inserted into a radial hole of a shaft part, and a drill sleeve (4) for replacing the positioning shaft (3). The clamp (2) is provided with a clamping part (21) and a locking assembly (22) for locking the shaft part to the clamping part (21). The clamping part (21) is provided with a guide sleeve (5) on at least one side and a positioning assembly (6) for fixing the position of the guide sleeve (5). The positioning shaft (3) is detachably inserted into the guide sleeve (5).

2. The fixture device for machining radial holes in shaft-type parts according to claim 1, characterized in that: The positioning component (6) includes a seal (61) and a heating cover (62). The outer periphery of the guide sleeve (5) has a gap with the clamp (2) to form a filling cavity for filling temperature phase change material. The seal (61) and the heating cover (62) are arranged opposite to each other on both sides of the filling cavity.

3. The fixture device for machining radial holes in shaft-type parts according to claim 2, characterized in that: The outer cylindrical surface of the guide sleeve (5) and the side wall of the filling cavity are both provided with spiral grooves (51).

4. The fixture device for machining radial holes in shaft-type parts according to claim 3, characterized in that: The temperature phase change material contains triangular pyramids (7) that can be embedded in the spiral groove (51).

5. The fixture device for machining radial holes in shaft parts according to claim 3, characterized in that: The spiral groove (51) on the outer cylindrical surface of the guide sleeve (5) rotates in the opposite direction to the rotation direction when the tool is cutting.

6. The fixture device for machining radial holes in shaft parts according to claim 3, characterized in that: The temperature phase change material is a Sn-Sb-Cu alloy, and the surface of the spiral groove (51) is provided with a silver plating layer.

7. The fixture device for machining radial holes in shaft-type parts according to claim 2, characterized in that: The temperature phase change material is a spherical particle material.

8. The fixture apparatus for machining radial holes in shaft-type parts according to any one of claims 1 to 7, characterized in that: The positioning shaft (3) includes a first segment (31) that can be inserted into a radial hole of a shaft-like part, a second segment (32) that passes through the guide sleeve (5), and a first flange (33) located at the end of the second segment (32) away from the first segment (31). The diameter of the first segment (31) is smaller than the diameter of the second segment (32) to form a stepped portion that abuts against the shaft-like part. The drill sleeve (4) has a second flange (41) at one end. The first flange (33) and the second flange (41) are used to detachably connect with the guide sleeve (5).

9. The fixture for machining radial holes in shaft-type parts according to any one of claims 1 to 7, characterized in that: The drill sleeve (4) has a hollow structure; and / or, the inner surface of the drill sleeve (4) is provided with a lubricating layer.

10. The fixture apparatus for machining radial holes in shaft-type parts according to any one of claims 1 to 7, characterized in that: It also includes a sleeve (8), the clamp (2) is inserted in the sleeve (8), the top surface of the sleeve (8) is provided with a shrinkage slit (81) and the middle part of the bottom surface is an arc structure, the height of the two ends of the bottom surface of the sleeve (8) is greater than that of the middle part and is provided with fasteners (82).

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